fix(Salary Structure Assignment): validate cost center company on server-side (backport #2445)

[mergify]

There is a filter for cost center selection based on company in Salary Structure Assignment already. But that won't work when assignments are created via data import.

This error doesn't get caught until accrual entry for payroll is attempted and it fails silently:

ValidationError: Journal Entry ACC-JV-2024-00060: Cost Center Executives - ADAED does not belong to Company Alchemative DMCC

Add a server-side validation in Salary Structure Assignment itself:

---

This is an automatic backport of pull request #2445 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of a3bc4e5 has failed:

On branch mergify/bp/version-14-hotfix/pr-2445
Your branch is up to date with 'origin/version-14-hotfix'.

You are currently cherry-picking commit a3bc4e585.
  (fix conflicts and run "git cherry-pick --continue")
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Unmerged paths:
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	both modified:   hrms/payroll/doctype/salary_structure_assignment/salary_structure_assignment.py

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[ruchamahabal]

unrelated test failure

[frappe-pr-bot]

🎉 This PR is included in version 14.35.2 🎉

The release is available on GitHub release

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